The Bible doesn't promote slavery, but it doesn't condemn it either?

God allows humans their own choices. He gives us laws to follow but does not make us follow them. That is why most people will never gain eternal salvation. Most people complain about the way God handled enemies of his people in the OT. They do not like that God did to those people what they did to his. Now they complain because he doesn't do anything about the evil things going on today. Seems like God can't win according to human thinking. But it doesn't matter. Soon God will take back rule of the earth from Satan and from mankind and restore it to the paradise he intended it to be in the first place. Then there will be no more sickness, pain or death. Ps. 37:29, Ps. 104:5. Rev. 21:4, Matthew 5:5.